ZIF-8掺杂石墨烯/壳聚糖小球吸附重金属Cu2+的研究
Adsorption of heavy metal Cu2+by ZIF-8 doped graphene/chitosan microspheres
吐孙尼亚则·麦麦提 1禹宝伟 1钟钦梅 1袁月 1杨胜韬1
作者信息
- 1. 西南民族大学化学与环境学院,四川成都 610041
- 折叠
摘要
水中重金属具有不可生物降解和生物富集性,因此水体重金属污染问题一直备受关注.制备易于回收的微米级锌基金属有机框架(ZIF-8)掺杂石墨烯/壳聚糖(GO/CS/ZIF-8)小球,重点关注该小球对水中典型重金属离子——Cu2+的吸附性能及机理.结果表明,GO/CS/ZIF-8小球对Cu2+的吸附量可达101.8 mg/g,且吸附以单分子层吸附为主,Freundlich模型能很好地模拟小球对Cu2+的等温吸附过程;吸附动力学拟合表明GO/CS/ZIF-8小球对Cu2+的吸附符合伪二级动力学模型,说明该吸附以化学吸附为主;吸附热力学数据表明该吸附为吸热过程,升温有利于吸附的进行.
Abstract
The issue of heavy metal pollution in water has garnered significant attention due to the non-biodegradable and bioen-riched nature.In this study,we prepared micro-scale sized Zinc-based metal-organic framework(ZIF-8)doped graphene/chi-tosan(GO/CS/ZIF-8)microspheres that can be easily recovered,with a focus on investigating their adsorption properties and mechanism towards Cu2+ions in aqueous solution.The results demonstrated that GO/CS/ZIF-8 microspheres exhibited an im-pressive adsorption capacity for Cu2+ions,reaching 101.8 mg/g primarily through single molecular layer chemisorption.Fur-thermore,the Freundlich model effectively simulated the isothermal adsorption process of Cu2+by GO/CS/ZIF-8 micro-spheres.The fitting analysis of adsorption kinetics demonstrated that the adsorption of Cu2+by GO/CS/ZIF-8 microspheres ad-hered to the pseudo-second-order kinetic model,indicating predominant chemisorption.Thermodynamic analysis revealed that this adsorption process was endothermic,with increased temperature favoring higher levels of adsorption.
关键词
ZIF-8/石墨烯/小球/Cu2+/吸附Key words
ZIF-8/graphene oxide/microsphere/Cu2+/adsorption引用本文复制引用
出版年
2024
NETL
NSTL
万方数据